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Enabling this option will cause the kernel to distinguish between
ioremapped and physical addresses. It will print a backtrace (at
most one every 10 seconds), hopefully allowing you to see which
drivers need work. Fixing all these problems is a prerequisite
for turning on USE_HPPA_IOREMAP. The warnings are harmless;
the kernel has enough information to fix the broken drivers
automatically, but we'd like to make it more efficient by not
having to do that.